CN115616369A - Health monitoring method for bonding wire of power module of wireless charging equipment of electric automobile - Google Patents
Health monitoring method for bonding wire of power module of wireless charging equipment of electric automobile Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/60—Other road transportation technologies with climate change mitigation effect
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
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Abstract
The invention discloses a health monitoring method for a bonding wire of a power module of wireless charging equipment of an electric automobile, and belongs to the field of reliability of power electronic devices. The monitoring method comprises the steps of constructing a monitoring loop 1 and a monitoring loop 2, monitoring the health state of reference data, performing real-time loop monitoring, correcting data, judging the health state and the like, non-contact monitoring can be realized through a loose coupling transformer of the wireless charging equipment of the electric automobile, and the monitoring method overcomes the defect of resonant capacitor C through correcting measured data 1 The effect of capacitance decay. In addition, the monitoring method provided by the invention can be realized on the primary side of the wireless charging equipment, the improvement on an automobile side circuit is not needed, and the realization cost is low.
Description
Technical Field
The invention relates to a health monitoring method for a power module, in particular to health monitoring for a bonding wire of the power module of wireless charging equipment of an electric automobile, and belongs to the field of reliability of power electronic devices.
Background
With the proposal of the national 'double-carbon' target, the electric automobile as a zero-emission automobile will undoubtedly become the prime force in the future automobile industry. Along with electric automobile rapid development, compare in traditional wired charging stake, contactless wireless charging equipment has huge development potential, must will obtain the wide application in the future. However, although the wireless charging device can realize flexible charging, the reliability of its internal power module is a non-negligible problem, and related research shows that, in a failed power electronic device, the failure ratio caused by the power module exceeds 30%.
In new forms of energy electric automobile, the operating environment that inside wireless battery charging outfit is located is very abominable: in the running process of the vehicle, although the equipment is in a stop state, the severe vibration of the vehicle body can affect the power module in the equipment; during charging, the inside of the module has repeated fluctuating power loss, and meanwhile, because the thermal expansion coefficients are different, the inside of the module is continuously subjected to the action of shear stress, and the bonding wire inside the module can be caused to lose effectiveness and fall off in the long term. Once the bonding wire is partially separated, the wireless charging equipment still can work, but the hidden trouble exists, and when the bonding wire is completely separated, the system is stopped due to failure. Because the bonding wire is packaged in the module, the system fault reason is difficult to find out generally, so the vehicle can only be returned to the factory for maintenance, thereby causing economic loss of different degrees. Under the circumstances, a method for monitoring the health of the bonding wire of the power module of the wireless charging equipment of the electric automobile is urgently needed, so that the aging and falling of the bonding wire can be found in time, the reliability of the bonding wire is improved, the possible economic loss is avoided, and the fault time is reduced.
The Chinese invention patent document (CN 113419155A) entitled "IGBT module on-line monitoring system and on-line monitoring method" introduces an on-line monitoring method for a power module in power electronic equipment, but hardware required by the method needs to be integrated into the tested equipment, and the method is not suitable for the interior of an electric automobile with narrow space.
The invention discloses a method for monitoring the state of an IGBT module (CN 114740327B), which is entitled 'method and device for monitoring the state of the IGBT module', but the method needs more measured parameters and has a more complex control system.
In summary, the existing power module health monitoring method has the following problems:
1) The limited space in the electric automobile is not considered, and the existing method needs to additionally add a circuit in the automobile;
2) The original loose coupling transformer of the equipment cannot be utilized to realize non-contact monitoring;
3) More parameters need to be measured.
Disclosure of Invention
The invention aims to solve the problems and provides a method for realizing health monitoring of a power module of wireless charging equipment on an automobile side on a charging pile side by using a loose coupling transformer of the wireless charging equipment of an electric automobile.
In order to achieve the purpose of the invention, the invention provides a method for monitoring the health of a bonding wire of a power module of a wireless charging device of an electric automobile, wherein the wireless charging device of the electric automobile comprises an automobile side circuit with a double LCC wireless charging topology, and the automobile side circuit comprises a direct current source E p A DC source equivalent internal resistance R, a DC side capacitor C 3 An H-bridge unit, two identical resonant capacitors and marked as resonant capacitor C 1 And a resonant capacitor C 2 A resonant inductor L 3 And a loosely coupled transformer, said DC source E p After being connected with the equivalent internal resistance R of the direct current source in series, the capacitor C at the direct current side 3 Parallel connection of H-bridge unit and DC side capacitor C 3 Connecting in parallel;
the H-bridge unit comprises 4 power modules M i I =1,2,3,4, wherein the power module M 1 And a power module M 3 In series, the connection point of which is designated as point c, power module M 2 And a power module M 4 In series, the connection point is denoted as point d; resonant inductor L 3 One end of the resonant capacitor C is connected with the other end of the contact 1 Resonant capacitor C 1 The other end of the transformer is connected with one terminal of a secondary coil of a loose coupling transformer, the other terminal of the secondary coil of the loose coupling transformer is connected with a contact point d, and a resonant capacitor C 2 One terminal of the resonant capacitor is connected to the resonant capacitor C 1 And a resonant inductor L 3 To (c) to (d);
the inductance of the primary winding of the loosely coupled transformer is noted as L 1 And the secondary coil inductance is noted as L 2 Primary side coilAnd the secondary coil are coupled with each other through mutual inductance M;
the monitoring method comprises the following steps:
step 1, construction of monitoring loop 1 and monitoring loop 2
When controlling the power module M 1 And a power module M 2 Are all continuously switched on, and the power module M 3 And a power module M 4 When the vehicle side circuits are continuously disconnected, the vehicle side circuits form a monitoring loop 1; when controlling the power module M 3 And a power module M 4 Are all continuously switched on, and the power module M 1 And a power module M 2 When the vehicle side circuits are all continuously disconnected, the vehicle side circuits form a monitoring loop 2;
At 4 power modules M i I =1,2,3,4, performing primary loop monitoring in a healthy state, setting a monitored frequency range and an interval frequency e, and recording the frequency of a monitoring point as a monitoring point frequency f j J =1,2,.. G, G is the maximum number of monitoring points;
monitoring the monitoring loops 1 at equal intervals by interval frequency e to obtain loop impedance of G monitoring loops 1, and recording the loop impedance as first reference loop impedance Z Hj G first reference loop impedances Z Hj The maximum value of (1) is denoted as Z H-max ；
Monitoring the monitoring loops 2 at the interval frequency e at equal intervals to obtain loop impedances of G monitoring loops 2, and recording the loop impedances as second reference loop impedance Z Nj G second reference loop impedances Z Nj The maximum value of (1) is denoted as Z N-max ；
Defining a reference impedance difference D HNj ，D HNj ＝Z Hj -Z Nj J =1,2.., G reference impedance differences D HNj The maximum value of (1) is denoted as D HN-max The minimum value is recorded as D HN-min And take D HN-max 、D HN-min The larger absolute value is recorded as the reference difference D 0 ；
Step 3, real-time loop monitoring is carried out
The monitoring loops 1 are monitored at equal intervals in real time at interval frequency e to obtain real-time loop impedance of G monitoring loops 1, and the real-time loop impedance is recorded as first real-time loop impedance Z hj G first real-time loop impedances Z hj The maximum value of (1) is denoted as Z h-max ；
The monitoring loops 2 are monitored at equal intervals in real time at interval frequency e to obtain real-time loop impedance of G monitoring loops 2, and the real-time loop impedance is recorded as second real-time loop impedance Z nj G second real-time loop impedances Z nj The maximum value of (1) is denoted as Z n-max ；
Defining a real-time impedance difference D hnj ，D hnj ＝Z hj -Z nj J =1,2, G, will be G real-time impedance differences D hnj The maximum value of (1) is denoted as D hn-max、 Minimum value is noted as D hn-min And take D hn-max 、D hn-min The middle absolute value is large and is recorded as the real time difference D s ；
Defining an impedance difference variation D, D = D s -D 0 ；
For the real-time difference D obtained in the step 3 s Correcting the real-time difference D s Is recorded as the optimum correction quantity D s ' the correction formula is as follows:
the impedance difference change amount D is corrected, and the corrected impedance difference change amount D is referred to as an impedance difference change correction amount D', and the correction formula is as follows:
D′＝D s ′-D 0
step 5, judging the health status
Comparison Z H-max And Z N-max Taking the value of (1), and recording the value of (1) as a standard value Z; recording the aging judgment threshold value as Z k ，Z k ＝1％Z；
Judging the threshold value Z according to aging k Sum impedance difference change correction amount D s ' making a health status determination:
when | D' | > Z k When the bonding wire is aged and falls off;
when | D' | is less than or equal to Z k And when the power module is in a healthy state, the bonding wire is healthy.
Preferably, the monitoring loop 1 in step 1 is a loosely coupled transformer and a resonant capacitor C 1 Resonant capacitor C 2 Resonant inductor L 3 Power module M 1 And a power module M 2 A loop formed by loosely coupling one end of the secondary winding of the transformer and a resonant capacitor C 1 Resonant inductor L 3 Power module M 1 Power module M 2 The other end point of the secondary coil of the loosely coupled transformer is sequentially connected in series with a resonant capacitor C 2 One end of which is connected to the resonant capacitor C 1 And a resonant inductor L 3 The other end of the transformer is connected with a secondary coil of the loosely coupled transformer and the power module M 2 In the meantime.
Preferably, the monitoring loop 2 in step 1 is a loosely coupled transformer and a resonant capacitor C 1 Resonant capacitor C 2 Resonant inductor L 3 Power module M 3 And a power module M 4 A loop formed by loosely coupling one end of the secondary winding of the transformer and a resonant capacitor C 1 Resonant inductor L 3 Power module M 3 Power module M 4 The other end point of the secondary coil of the loosely coupled transformer is sequentially connected in series with a resonant capacitor C 2 One end of which is connected to the resonant capacitor C 1 And a resonant inductor L 3 The other end of the transformer is connected with a secondary coil of the loosely coupled transformer and the power module M 4 In the meantime.
Compared with the prior art, the invention has the following beneficial effects:
1. the monitoring method can realize the health monitoring of the bonding wire of the power module at the side of the automobile by utilizing the original loose coupling transformer of the wireless charging equipment.
2. The monitoring method does not need to modify the automobile side circuit, and has low technical cost.
3. The monitoring method of the invention only needs to measure one characteristic parameter.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
FIG. 2 is a schematic diagram of a vehicle-side circuit topology according to an embodiment of the present invention.
Fig. 3 is a topology diagram of the monitoring circuit 1 constructed in the embodiment of the present invention.
Fig. 4 is a topological diagram of the monitoring loop 2 constructed in the embodiment of the present invention.
FIG. 5 shows Z in a healthy state according to an embodiment of the present invention Hj -f j A curve.
FIG. 6 shows a state of health D in an embodiment of the present invention HNj -f j Curve line.
FIG. 7 shows an embodiment of the present invention in which only power module M is provided 1 D under the state that two bonding wires are aged and fall off hnj -f j Curve
FIG. 8 shows a power module M according to an embodiment of the present invention 1 Two bonding wires are aged and fall off, and the resonant capacitor C 1 D in the state of 5% capacity value attenuation hnj -f j Curve
Detailed Description
The invention is further illustrated by the following specific embodiments in combination with the accompanying drawings.
FIG. 2 is a topology diagram of a car-side circuit according to an embodiment of the present invention, and as shown in FIG. 1, the wireless charging device for an electric car according to the present invention includes a car-side circuit with a dual LCC wireless charging topology, and the car-side circuit includes a DC source E p A DC source equivalent internal resistance R, a DC side capacitor C 3 An H-bridge unit, two identical resonant capacitors and marked as resonant capacitor C 1 And a resonance capacitor C 2 A resonant inductor L 3 And a loosely coupled transformer, said DC source E p Is connected with the DC source equivalent internal resistance R in series and then is connected with the DC side capacitor C 3 Parallel connection of H-bridge unit and DC side capacitor C 3 And (4) connecting in parallel.
The H-bridge unit comprises 4 power modules M i I =1,2,3,4, wherein the power module M 1 And a power module M 3 In series, the connection points of which are pointsc, power module M 2 And a power module M 4 In series, the connection point is denoted as point d; resonant inductor L 3 One end of the resonant capacitor C is connected with the other end of the resonant capacitor C 1 Resonant capacitor C 1 The other end of the second end of the loosely coupled transformer is connected with one terminal of the secondary coil of the loosely coupled transformer, the other terminal of the secondary coil of the loosely coupled transformer is connected with a contact point d, and a resonant capacitor C 2 One end of the capacitor is connected to the contact d and the other end is connected to the resonant capacitor C 1 And a resonant inductor L 3 In the meantime.
The inductance of the primary winding of the loosely coupled transformer is noted as L 1 The inductance of the secondary winding is marked as L 2 The primary coil and the secondary coil are mutually coupled through mutual inductance M;
in fig. 2, a and b are two terminals of the primary coil of the loosely coupled transformer.
The invention is implemented by setting the following relevant electrical parameters:
E p ＝330V，R＝0.5Ω，C 3 =330uF, operating frequency of loosely coupled transformer f =85000hz 1 ＝225.18uH，L 2 ＝227.23uH，M＝37.64uH，C 1 ＝18nF，C 2 ＝120nF，L 3 ＝31uH。
Fig. 1 is a flow chart of the monitoring method of the present invention, and as can be seen from fig. 1, the monitoring method of the present invention comprises the following steps:
step 1, construction of monitoring loop 1 and monitoring loop 2
When controlling the power module M 1 And a power module M 2 Are all continuously switched on, and the power module M 3 And a power module M 4 When the automobile side circuits are continuously disconnected, the automobile side circuits form a monitoring loop 1; when controlling the power module M 3 And a power module M 4 Are all continuously switched on, and the power module M 1 And a power module M 2 When the vehicle side circuit is continuously disconnected, the vehicle side circuit forms a monitoring loop 2.
FIG. 3 is a topological diagram of a monitoring loop 1 constructed in the embodiment of the present invention, and it can be seen from the diagram that the monitoring loop 1 is a loose coupling transformer and a resonant capacitor C 1 Resonant capacitor C 2 Resonant inductor L 3 Power moduleM 1 And a power module M 2 A loop formed by loosely coupling one end of the secondary winding of the transformer and a resonant capacitor C 1 Resonant inductor L 3 Power module M 1 Power module M 2 The other end point of the secondary coil of the loosely coupled transformer is sequentially connected in series with a resonant capacitor C 2 One end of which is connected to the resonant capacitor C 1 And a resonant inductor L 3 The other end of the transformer is connected with a secondary coil of the loosely coupled transformer and the power module M 2 In the meantime.
FIG. 4 is a topological diagram of a monitoring loop 2 constructed in the embodiment of the present invention, and it can be seen from the diagram that the monitoring loop 2 is a loosely coupled transformer and a resonant capacitor C 1 Resonant capacitor C 2 Resonant inductor L 3 Power module M 3 And a power module M 4 A loop formed by loosely coupling one end of the secondary winding of the transformer and a resonant capacitor C 1 Resonant inductor L 3 Power module M 3 Power module M 4 The other end point of the secondary coil of the loosely coupled transformer is sequentially connected in series with a resonant capacitor C 2 Is connected to the resonant capacitor C 1 And a resonant inductor L 3 The other end of the transformer is connected with a secondary coil of the loosely coupled transformer and the power module M 4 In the meantime.
At 4 power modules M i I =1,2,3,4, performing primary loop monitoring in a healthy state, setting a monitoring frequency range and an interval frequency e, and recording the frequency of a monitoring point as a monitoring point frequency f j J =1,2,.. G, G is the maximum number of monitoring points;
monitoring the monitoring loops 1 at equal intervals by interval frequency e to obtain loop impedance of G monitoring loops 1, and recording the loop impedance as first reference loop impedance Z Hj G first reference loop impedances Z Hj The maximum value of (1) is denoted as Z H-max ；
Monitoring the monitoring loops 2 at the interval frequency e at equal intervals to obtain loop impedances of G monitoring loops 2, and recording the loop impedances as second reference loop impedancesZ Nj G second reference loop impedances Z Nj The maximum value of (1) is denoted as Z N-max ；
Defining a reference impedance difference D HNj ，D HNj ＝Z Hj -Z Nj J =1,2.., G reference impedance differences D HNj The maximum value of (1) is denoted as D HN-max The minimum value is recorded as D HN-min， And get D HN-max 、D HN-min The larger absolute value is recorded as the reference difference D 0 。
In the present embodiment, the monitored frequency range is set to 0Hz-100KHz, the interval frequency e =1hz, and g =100000. G first reference loop impedances Z in a healthy state are measured Hj Maximum value of Z H-max 3113.3 Ω, G second reference loop impedances Z in healthy state Ni Maximum value of Z N-max Is 3153 omega, and G reference impedance differences D in a healthy state HNj Reference difference D in 0 Is-39.7 omega.
FIG. 5 shows the first reference loop impedance Z Hj Is the vertical axis, frequency f j Z plotted for the horizontal axis in a plane coordinate system Hj -f j Curve, fig. 6 is a graph of the reference impedance difference D HNj Is the vertical axis, frequency f j Plotted for the horizontal axis in a planar coordinate system D HNj -f j A curve.
Step 3, real-time loop monitoring is carried out
Monitoring the monitoring loops 1 at the interval frequency e in real time at equal intervals to obtain real-time loop impedances of the G monitoring loops 1, and recording the real-time loop impedances as a first real-time loop impedance Z hj G first real-time loop impedances Z hj The maximum value of (1) is denoted as Z h-max ；
The monitoring loops 2 are monitored at equal intervals in real time at interval frequency e to obtain real-time loop impedance of G monitoring loops 2, and the real-time loop impedance is recorded as second real-time loop impedance Z nj G second real-time loop impedances Z nj The maximum value of (1) is denoted as Z n-max ；
Defining a real-time impedance difference D hnj ，D hnj ＝Z hj -Z nj J =1,2.., G real-time impedance differences D hnj The maximum value of (1) is denoted as D hn-max The minimum value is recorded as D hn-min And taking D hn-max 、D hn-min The middle absolute value is large and is recorded as the real time difference D s 。
In the present embodiment, when the power module M 1 G first real-time loop impedances Z when two bonding wires are aged and fall off hj Maximum value Z in h-max 3003 omega, G second real-time loop impedances Z nj Maximum value of Z n-max 3153 Ω, real time difference D s Is-149.9 omega and is,
when the power module M 1 G first real-time loop impedances Z when two bonding wires are aged and fall off and the capacitance value of the resonant capacitor C1 is attenuated by 5% hj Maximum value of Z h-max 3479 Ω, G second real-time loop impedances Z nj Maximum value Z in n-max 3653 Ω, real time difference D s Is-173.7 omega.
FIG. 7 shows only power module M 1 In the state that two bonding wires are aged and fall off, the real-time impedance difference D is obtained hnj Is the vertical axis, frequency f j Plotted for the horizontal axis in a planar coordinate system D hnj -f j Graph, FIG. 8 is a power module M 1 Aging and falling off of two bonding wires occur, and the capacitance value of the resonant capacitor C1 is attenuated by 5%, the real-time impedance difference D is obtained hnj Is the vertical axis, frequency f j Plotted for the horizontal axis in a planar coordinate system D hnj -f j Curve line.
Defining impedance difference variation D, D = D s -D 0 ；
For the real-time difference D obtained in the step 3 s Correcting the real-time difference D s Is recorded as the optimum correction quantity D s ' the correction formula is as follows:
the impedance difference change amount D is corrected, and the corrected impedance difference change amount D is referred to as an impedance difference change correction amount D', and the correction formula is as follows:
D′＝D s ′-D 0
step 5, judging the health status
Comparison Z H-max And Z N-max Taking the value of (1), and recording the value of (1) as a standard value Z; recording the aging judgment threshold value as Z k ，Z k ＝1％Z；
Judging the threshold value Z according to aging k Sum impedance difference change correction amount D s ' making a health status determination:
when | D' | > Z k When the bonding wire is aged and falls off;
when | D' | ≦ Z k And when the power module is in a healthy state, the bonding wire is healthy.
In this example, the power module M in the circuit shown in FIG. 1 is set 1 Two bonding wires are aged and fall off. At this time, Z H-max Is 3113.3 omega, Z N-max Is 3153 omega.
In this example, the aging determination threshold value Z k =3153 Ω × 1% =31.53 Ω. In the two cases, the impedance difference change correction amounts D ' are-149.90 Ω and-149.93 Ω, i.e. the absolute values | D ' | of the corresponding impedance difference change correction amounts D ' are both greater than the aging determination threshold Z k Therefore, the aging and falling of the bonding wire are successfully monitored, and the resonant capacitor C is overcome 1 The effect of aging.
Claims (3)
1. A health monitoring method for a bonding wire of a power module of a wireless charging device of an electric automobile is provided, wherein the wireless charging device of the electric automobile comprises an automobile side circuit with double LCC wireless charging topology, and the automobile side circuit comprises a direct current source E p A DC source equivalent internal resistance R, a DC side capacitor C 3 An H-bridge unit, two identical resonant capacitors and marked as resonant capacitor C 1 And a resonance capacitor C 2 A resonant inductor L 3 And a loosely coupled transformer, said DC source E p After being connected with the equivalent internal resistance R of the direct current source in series, the capacitor C at the direct current side 3 Parallel connection of H-bridge unit and DC side capacitor C 3 Parallel connection;
the H-bridge unit comprises 4 power modules M i I =1,2,3,4, wherein the power module M 1 And a power module M 3 Series connection, the connection point of which is denoted as point c, power module M 2 And a power module M 4 In series, the connection point is denoted as point d; resonant inductor L 3 One end of the resonant capacitor C is connected with the other end of the resonant capacitor C 1 Resonant capacitor C 1 The other end of the second end of the loosely coupled transformer is connected with one terminal of the secondary coil of the loosely coupled transformer, the other terminal of the secondary coil of the loosely coupled transformer is connected with a contact point d, and a resonant capacitor C 2 One end of the capacitor is connected to the contact d and the other end is connected to the resonant capacitor C 1 And a resonant inductor L 3 To (c) to (d);
the inductance of the primary winding of the loosely coupled transformer is noted as L 1 The inductance of the secondary winding is marked as L 2 The primary coil and the secondary coil are mutually coupled through mutual inductance M;
the monitoring method is characterized by comprising the following steps:
step 1, construction of monitoring loop 1 and monitoring loop 2
When controlling the power module M 1 And a power module M 2 Are all continuously switched on, and the power module M 3 And a power module M 4 When the vehicle side circuits are continuously disconnected, the vehicle side circuits form a monitoring loop 1; when controlling the power module M 3 And a power module M 4 Are all continuously switched on, and the power module M 1 And a power module M 2 When the vehicle side circuits are all continuously disconnected, the vehicle side circuits form a monitoring loop 2;
step 2, carrying out primary loop monitoring in a healthy state to obtain reference data
At 4 power modules M i I =1,2,3,4, performing primary loop monitoring in a healthy state, setting a monitoring frequency range and an interval frequency e, and recording the frequency of a monitoring point as a monitoring point frequency f j J =1,2,.. G, G is the maximum number of monitoring points;
monitoring the monitoring loops 1 at equal intervals by interval frequency e to obtain loop impedance of G monitoring loops 1, and recording the loop impedance as first reference loop impedance Z Hj G first referencesLoop impedance Z Hj The maximum value of (1) is denoted as Z H-max ；
Monitoring the monitoring loops 2 at the interval frequency e at equal intervals to obtain loop impedances of G monitoring loops 2, and recording the loop impedances as second reference loop impedance Z Nj G second reference loop impedances Z Nj The maximum value of (1) is denoted as Z N-max ；
Defining a reference impedance difference D HNj ，D HNj ＝Z Hj -Z Nj J =1,2.., G reference impedance differences D HNj The maximum value of (1) is denoted as D HN-max The minimum value is recorded as D HN-min And take D HN-max 、D HN-min The larger absolute value is recorded as the reference difference D 0 ；
Step 3, real-time loop monitoring is carried out
Monitoring the monitoring loops 1 at the interval frequency e in real time at equal intervals to obtain real-time loop impedances of the G monitoring loops 1, and recording the real-time loop impedances as a first real-time loop impedance Z hj G first real-time loop impedances Z hj The maximum value of (1) is denoted as Z h-max ；
The monitoring loops 2 are monitored at equal intervals in real time at interval frequency e to obtain real-time loop impedance of G monitoring loops 2, and the real-time loop impedance is recorded as second real-time loop impedance Z nj G second real-time loop impedances Z nj The maximum value of (1) is denoted as Z n-max ；
Defining a real-time impedance difference D hnj ，D hnj ＝Z hj -Z nj J =1,2.., G real-time impedance differences D hnj The maximum value of (1) is denoted as D hn-max The minimum value is recorded as D hn-min And take D hn-max 、D hn-min The middle absolute value is large and is recorded as the real time difference D s ；
Step 4, obtaining a variation correction quantity D'
Defining an impedance difference variation D, D = D s -D 0 ；
For the real-time difference D obtained in the step 3 s Correcting the real-time difference D s Is recorded as the optimum correction amount D s ' the correction formula is as follows:
the impedance difference change amount D is corrected, and the corrected impedance difference change amount D is regarded as an impedance difference change correction amount D', and the correction formula is as follows:
D′＝D s ′-D 0
step 5, judging the health status
Comparison of Z H-max And Z N-max Taking the value of (1), and recording the value of (1) as a standard value Z; recording the aging judgment threshold value as Z k ，Z k ＝1％Z；
Judging the threshold value Z according to aging k Sum impedance difference change correction amount D s ' making a health status determination:
when | D' | > Z k When the bonding wire is aged and falls off;
when | D' | ≦ Z k And when the power module is in a healthy state, the bonding wire is healthy.
2. The method for monitoring the health of the bonding wire of the power module of the wireless charging device of the electric vehicle as claimed in claim 1, wherein the monitoring loop 1 in the step 1 is a loosely coupled transformer and a resonant capacitor C 1 Resonant capacitor C 2 Resonant inductor L 3 Power module M 1 And a power module M 2 A loop formed by loosely coupling one end of the secondary winding of the transformer and a resonant capacitor C 1 Resonant inductor L 3 Power module M 1 Power module M 2 The other end point of the secondary coil of the loosely coupled transformer is sequentially connected in series with a resonant capacitor C 2 One end of which is connected to the resonant capacitor C 1 And a resonant inductor L 3 The other end of the transformer is connected with a secondary coil of the loosely coupled transformer and the power module M 2 In the meantime.
3. The method for monitoring health of the bonding wire of the power module of the wireless charging device of the electric vehicle as claimed in claim 1, wherein the method is characterized in thatIn step 1, the monitoring loop 2 is a loose coupling transformer and a resonant capacitor C 1 Resonant capacitor C 2 Resonant inductor L 3 Power module M 3 And a power module M 4 A loop formed by loosely coupling one end of the secondary winding of the transformer and a resonant capacitor C 1 Resonant inductor L 3 Power module M 3 Power module M 4 The other end point of the secondary coil of the loosely coupled transformer is sequentially connected in series with a resonant capacitor C 2 One end of which is connected to the resonant capacitor C 1 And a resonant inductor L 3 The other end of the transformer is connected with a secondary coil of the loosely coupled transformer and the power module M 4 In the meantime.
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